Koss KPH7 on ear headphones are a lightweight design that delivers the full power of the Sound of Koss. Delivering incredible sound performance, it is ideal for listeners seeking ultra-light headphones. The KPH7 on ear headphone is equipped with dynamic elements for an extended frequency response. It features an over the head design with contemporary style. Perfect for use with portable MP3 players or iPods, the KPH7 is the perfect headphone. Specifications: Frequency Range: 80 - 18,000 Hz, Impedantion: 32 Ohms, Sensitivity: 91 dB SPL, Straight, Dual Entry, 4ft cord. Finish: Green